Stapler

A stapler comprising an upper casing base, a lower casing base and a staple box pivotally combined together, said staple box moved together with said upper casing base, said upper casing base and said staple box pressed downward on said lower casing base to release staples for carrying out stapling work:

• and characterized by,
• Said upper and said lower casing base made of plastic, said lower casing base having its topside formed with an accommodating space, said accommodating space having its front vertical wall bored with an insert groove in the upper inner surface, said accommodating space having its rear vertical wall formed with a recess in the upper inner surface, said recess having its upper edge formed with a blocking surface, a casing cover covered on said accommodating space, said casing cover having its front end formed with an insert member extending outward, said insert member inserted in said insert groove of said front vertical wall of said accommodating space, said casing cover having its rear end formed with an elastic press retainer corresponding to said recess of said rear vertical wall of said accommodating space, said elastic press retainer having a basic portion extending downward from the topside of said casing cover, said basic portion of said elastic press retainer having its lower end bent upward to form an elastic press portion, said elastic press portion formed with a holding block at a location corresponding to said blocking surface of said rear vertical wall of said accommodating space, said casing cover able to be firmly assembled on said accommodating space by mutual engagement of said holding block of said elastic press retainer and said blocking surface.